strace-ff.test: fix race condition
* tests/strace-ff.test: Wait for completion of PR_SET_PTRACER command.
diff --git a/tests/strace-ff.test b/tests/strace-ff.test
index d1e0634..2ce06f1 100755
--- a/tests/strace-ff.test
+++ b/tests/strace-ff.test
@@ -4,18 +4,26 @@
. "${srcdir=.}/init.sh"
-rm -f "$LOG".*
+run_prog_skip_if_failed \
+ kill -0 $$
-./set_ptracer_any ./sleep 1 > /dev/null &
-PID=$!
-run_strace -a14 -eexit_group -ff -p $PID
+./set_ptracer_any ./sleep 1 > "$OUT" &
+tracee_pid=$!
+
+while ! [ -s "$OUT" ]; do
+ kill -0 $tracee_pid 2> /dev/null ||
+ fail_ 'set_ptracer_any sleep failed'
+done
+
+rm -f "$LOG".*
+run_strace -a14 -eexit_group -ff -p $tracee_pid
# check that output matches
-match_diff "$LOG.$PID"
+match_diff "$LOG.$tracee_pid"
# check that no other output files have been created
set -- "$LOG".*
-[ "$LOG.$PID" = "$*" ] ||
+[ "$LOG.$tracee_pid" = "$*" ] ||
fail_ "too many output files: $*"
-rm -f "$LOG.$PID"
+rm -f "$OUT" "$LOG.$tracee_pid"
